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blsea [12.9K]
3 years ago
15

Find the arithmetic mean an of an-1=3.9 and an+1=7.1

Mathematics
2 answers:
vladimir2022 [97]3 years ago
5 0
A[n] = (a[n-1] +a[n+1])/2 = (3.9 +7.1)/2 = 11/2 = 5.5
labwork [276]3 years ago
3 0

The arithmetic mean is 5.5

So therefor the answer is 5.5

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Simplify the ratio 25 :15
Sedbober [7]

Answer:

5/3

Step-by-step explanation:

Find the GCD (or HCF) of numerator and denominator

GCD of 25 and 15 is 5

Divide both the numerator and denominator by the GCD

25 ÷ 5

15 ÷ 5

Reduced fraction:  

5

3

Therefore, 25/15 simplified to lowest terms is 5/3.

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Read 2 more answers
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coldgirl [10]

Answer:

-10 and -2/5

Step-by-step explanation

-10÷ -\frac{2}{5} = 25

Check

25 > 10

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3 years ago
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answer:

338 out of 520

step by step:

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338 students out of 520 do not favor mysteries

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